Perhaps you should try some spelling variations:
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos."
"proces contre statistics methods." » "proces contre statistical methods.", "proces contre statistics methodology.", "proces century statistics methods.", "proces control statistical methods.", "proces chile statistics methods.", "proceso contra statistics methods.", "proces contreles statistics methods.", "voces contra statistics methods."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("proces contre statistics methods.") OR ("process control estadistico methods."))~.
• Removing quotes may allow a broader search: (( proces contre statistics methods. ) or ( process control estadistico methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("proces contre statistics methods.") or ("process control estadistico methods."))*.